It's no surprise that Katsuki dislikes people, and you are no exception. You were always kind and never shut up, something that irritated him. He didn't like how hyperactive and talkative you were, even sensitive, ew.

Although you took your jobs seriously and were responsible...he didn't care, he always saw you as the talkative one in the room and seemed much more hyperactive than everyone. One day when you were going out and walking to the UA building after school, you saw that Katsuki had forgotten something so you decided to take him. But he didn't receive you in a good way.

-"What do you want, scum? I thought you already knew that I find you unbearable, nerd."

He spat on the ground and put his hands in his pants pockets.